in 18th century 要不要加the变成in the 18th century

in 18th century 要不要加the变成in the 18th century Europe in the 18th century是什么意思 Realistic novel in the 18th century 初中英语in the 18th and 19th centuryin the 18th and 19th century（century要变为复数centuries吗?为什么?） 在19世纪,翻译成英语in 19th century中间要加the吗? in the 20th century,in the 1950s,这两个时间词的前面为什么要加 the? 可以说in 20th century?in后必须加the吗? in the 16th century什么意思 in the 20th century是什么意思 early in the 18th century是译成早在18世纪 还是18世纪初期 18世纪表示的是从几几年到几几年呀?用英语有几种表示法,写法?前面用不用加the呀,还是随便怎么样都行?in the 18th century---在18世纪,18后的th可以不加上去吗?18 century,若能意思也是一样的,指18 英译中 in the 1950s in the 19th century 为什么in modern times和in January可以不加thein the 20th century和 in the middle ages可以加the In the 8th century,the game was very popular.In the 8th century,the game was very popular.这句话前面的状语一定要加逗号吗?如果换成the game was very popular in the 8th century,后面状语就不需要加逗号了吗?这两个句子 帮忙用英语写下“17世纪和18世纪的英国文学史”这篇文章标题“he 17th century and 18th century literature in Great Britain”写得好会再加高分!标题“the 17th century and 18th century literature in Great Britain”谢 in the second half of the 19th century 谁翻译一下：In 19th-century Europe. a leading figure in the 20th century theater. meaning